Centralized Versus Distributed Architecture for xDSL Networks

The first generation DSLAMs are considered ATM multiplexers that aggregate ATM VCs coming from subscribers into a bigger trunk feeding into an ATM cloud. As more and more DSL lines get deployed, a need exists for DSLAMs to get smarter and distinguish different levels of service that the end user subscribed to. These second generation DSLAMs support different ATM QoS, PNNI, and SVCs and a full ATM switch in their entirety.

The third generation of DSLAMs incorporate Layer 3 functionality making DSLAMs routers with full routing capabilities and able to aggregate various access encapsulation methods. DSLAMs now suddenly become more intelligent pushing Layer 3 services down to the edge ...

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